How to Make Cold Brewed Coffee

Quick Answer

• Use coarse grounds and cold water.
• Steep for 12-24 hours.
• Strain thoroughly.
• Dilute the concentrate to taste.
• Store in the fridge.
• Experiment with different beans and steep times.

Who This Is For

• Anyone who loves smooth, low-acid coffee.
• Folks who want to prep coffee ahead of time.
• Home baristas looking to expand their skills.

What to Check First

Brewer Type and Filter Type

You don’t need fancy gear. A big mason jar or a French press works. For filtering, cheesecloth, a fine-mesh sieve, or a dedicated cold brew maker will do the trick. Just make sure your filter can handle fine grounds without letting too much sediment through.

You don’t need fancy gear. A big mason jar or a French press works. For an easy and affordable option, consider a large mason jar with a lid.

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Water Quality and Temperature

Tap water is usually fine, but if yours tastes funky, so will your coffee. Filtered water is your friend here. And as the name implies, use cold water. Room temperature is okay in a pinch, but cold is best for that slow, smooth extraction.

Grind Size and Coffee Freshness

This is key. You want a coarse grind, like breadcrumbs or kosher salt. Too fine, and you’ll get mud. Freshly roasted beans are always better, but for cold brew, even day-old coffee can work. Just grind it right before you brew.

Coffee-to-Water Ratio

A good starting point is a 1:4 ratio of coffee to water. So, for every ounce of coffee, use four ounces of water. This makes a concentrate. You’ll dilute it later. Don’t be afraid to adjust this based on your taste.

Cleanliness/Descale Status

Your brewer and any containers should be spotless. Old coffee oils can turn rancid and ruin your batch. If you have a machine, make sure it’s descaled according to the manual. A clean setup means clean coffee.

Step-by-Step: How Do You Make Cold Brewed Coffee?

1. Measure your coffee. Use a scale for accuracy. A 1:4 ratio is a good start.

• Good looks like: Precise measurement, no guesswork.
• Common mistake: Eyeballing it. You’ll get inconsistent results. Use a scale.

2. Grind your beans coarsely. Aim for breadcrumb consistency.

• Good looks like: Even, coarse particles.
• Common mistake: Using a fine grind. This leads to over-extraction and bitterness.

3. Combine coffee and water in your brewer. Gently stir to ensure all grounds are saturated.

• Good looks like: All grounds are wet, no dry pockets.
• Common mistake: Not stirring. Dry grounds won’t extract properly.

4. Cover the brewer. Use a lid, plastic wrap, or a plate.

• Good looks like: A sealed container to keep things out and flavors in.
• Common mistake: Leaving it open. You risk contamination and evaporation.

5. Steep at room temperature or in the fridge. 12-24 hours is the sweet spot. Longer means stronger.

• Good looks like: Patience. The magic happens slowly.
• Common mistake: Rushing it. Cold brew needs time. Don’t cut the steep short.

6. Prepare your filtering setup. Line a sieve with cheesecloth or have your cold brew maker ready.

• Good looks like: A clean, secure filter ready to catch the grounds.
• Common mistake: Using a filter that’s too fine or not secure. Grounds will get into your brew.

7. Slowly strain the coffee concentrate. Pour it through your filter into a clean container. You might need to strain twice for clarity.

• Good looks like: A steady stream of dark liquid, minimal sediment.
• Common mistake: Pouring too fast. This can clog your filter and push fines through.

8. Discard the wet grounds. Compost them if you can.

• Good looks like: Clean grounds, ready for their next life.
• Common mistake: Leaving them sitting around. They can get moldy.

9. Dilute the concentrate. Start with a 1:1 ratio of concentrate to water or milk. Adjust to your liking.

• Good looks like: A balanced, drinkable coffee.
• Common mistake: Drinking the concentrate straight. It’s too strong!

10. Serve over ice. Add sweetener or milk if desired.

• Good looks like: A refreshing, delicious cup.
• Common mistake: Not chilling it enough. Cold brew is best served cold.

11. Store the concentrate in the fridge. It’ll last up to two weeks.

• Good looks like: A sealed container, clearly labeled.
• Common mistake: Leaving it out. Bacteria love room-temperature coffee.

Common Mistakes (and What Happens If You Ignore Them)

Mistake	What it Causes	Fix
Using a fine coffee grind	Muddy, bitter coffee; clogged filter	Use a coarse grind (like breadcrumbs).
Not stirring the grounds and water	Uneven extraction; weak spots in the brew	Gently stir to ensure all grounds are saturated.
Steeping for too short a time	Weak, watery coffee	Steep for at least 12 hours, up to 24.
Steeping for too long	Over-extracted, bitter, and potentially stale taste	Stick to the 12-24 hour window. Taste as you go if unsure.
Using tap water with off-flavors	Off-flavors in your coffee	Use filtered or bottled water.
Not cleaning your brewing equipment	Rancid coffee oils; stale taste	Wash all equipment thoroughly after each use.
Not diluting the concentrate	Extremely strong, unpleasant coffee	Dilute with water, milk, or ice. Start with 1:1 and adjust.
Straining too quickly or with a poor filter	Sediment in your final cup	Strain slowly and use a fine-mesh sieve, cheesecloth, or a dedicated cold brew filter. Strain twice if needed.
Storing the concentrate improperly	Spoilage, off-flavors	Keep concentrate in an airtight container in the refrigerator.
Using stale or old coffee beans	Flat, uninspired flavor	Use freshly roasted beans if possible, or at least beans roasted within the last few months.

Decision Rules

• If your cold brew tastes bitter, then you likely used too fine a grind or steeped too long because these lead to over-extraction.
• If your cold brew is weak, then you probably didn’t steep it long enough or used too little coffee because under-extraction is the culprit.
• If you see a lot of sediment, then your filter wasn’t fine enough or you poured too fast because these allow coffee fines to pass through.
• If your cold brew has a “off” taste, then your water quality might be poor or your equipment wasn’t clean because contaminants transfer easily.
• If you want a stronger concentrate, then increase the coffee-to-water ratio because more coffee means a richer brew.
• If you prefer a less intense flavor, then decrease the coffee-to-water ratio or dilute more because this controls the strength.
• If you’re brewing for the first time, then start with a 1:4 ratio and 18 hours because this is a solid baseline for most beans.
• If you’re using a French press, then be extra careful during the second filtration step because the plunger can push fine grounds through.
• If you want to experiment with flavor, then try different single-origin beans because each will offer unique tasting notes.
• If you’re in a hurry, then cold brew isn’t your best bet because it’s a slow process. Consider an Aeropress or pour-over for speed.

FAQ

How long does cold brew take?

It takes 12 to 24 hours to steep. This slow process is what makes it so smooth.

Can I use hot water to speed it up?

No, that defeats the purpose of cold brew. Using hot water will extract different compounds and result in a different, likely more acidic, coffee.

What’s the best coffee bean for cold brew?

Medium to dark roasts often work well, but you can use any bean you like. Experiment to find your favorite!

How do I store cold brew concentrate?

Keep it in an airtight container in the refrigerator. It should stay fresh for up to two weeks.

Why is my cold brew cloudy?

This usually means your filter wasn’t fine enough, or you poured too quickly. Try straining it a second time through a finer filter, like cheesecloth.

Can I make cold brew without a special maker?

Absolutely. A large jar, a sieve, and some cheesecloth are all you need to get started.

What’s the difference between cold brew and iced coffee?

Iced coffee is typically hot-brewed coffee that’s cooled down and served over ice. Cold brew is brewed with cold water over a long period, resulting in a less acidic, smoother flavor.

How much caffeine is in cold brew?

Cold brew concentrate is very potent. The caffeine content depends on the coffee-to-water ratio and steep time, but it’s generally higher than regular drip coffee. Always dilute it!

What This Page Does Not Cover (and Where to Go Next)

• Detailed explanations of different coffee bean varietals and their impact on cold brew flavor.
• Advanced filtering techniques for ultra-clear cold brew.
• Specific recommendations for electric cold brew makers.
• Recipes for cold brew cocktails or desserts.
• The science behind coffee extraction and how it applies to cold brewing.